Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1990-07-18
1992-07-28
Williams, Hezron E.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, 335296, G01R 3320
Patent
active
051343746
ABSTRACT:
A magnetic field control apparatus for establishing a uniform field of flux for use in magnetic resonance imaging has a pair of opposed magnetic poles mounted on end plates of variable thickness. A pair of substantially flat parallel pole faces are attached to the facing surfaces of the magnetic poles. The end plates are supported by connecting members. In addition, there is included a plurality of segments movably mounted to the periphery of the pole face for adjusting the density of the magnetic field. The top and bottom end plates may have substantially identical concave portions on the opposite outside surfaces thereof. The magnetic poles and pole faces are preferably in the shape of thin, flat, circular plates. In one embodiment, there is included one or more inner segmented concentric rings for further adjustably controlling the homogeneity of the uniform magnetic flux in the air gap between the opposing pole faces into which a patient can be inserted for magnetic resonance imaging. In another embodiment, the end plates are shaped so that the aggregate cross-sectional area taken in any plane perpendicular to the direction of the return flow of flux is substantially constant.
REFERENCES:
patent: 4695802 (1987-09-01), Zijlstra
patent: 4766378 (1988-08-01), Danby et al.
patent: 4943774 (1990-07-01), Breneman et al.
patent: 4980641 (1990-12-01), Breneman et al.
Breneman Bruce C.
Parker J. Wesley
Sarwinski Raymond E.
Applied Superconetics
Arana Louis M.
Williams Hezron E.
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